O. Rogachevsky

Chiral vortaic effect and neutron asymmetries in heavy-ion collisions

We study the possibility of testing experimentally signatures of P-odd effects related to the vorticity of the medium. The chiral vortaic effect is generalized to the case of conserved charges different from the electric one. In the case of baryonic charge and chemical potential, such an effect should manifest itself in neutron asymmetries measured by the Multipurpose Detector at the Nuclotron-Based Ion Collider Facility accelerator complex. The required accuracy may be achieved in a few months of accelerator running. We also discuss polarization of the hyperons and P-odd correlations of particle momenta (handedness) as probes of vorticity.

Event simulation based on three-fluid hydrodynamics for collisions at energies available at the Dubna Nuclotron-based Ion Collider Facility and at the Facility for Antiproton and Ion Research in Darmstadt

We present a new event generator based on the three-fluid hydrodynamics approach for the early stage of the collision, followed by a particlization at the hydrodynamic decoupling surface to join to a microscopic transport model, UrQMD, to account for hadronic final state interactions. We present first results for nuclear collisions of the FAIR/NICA energy scan program (Au+Au collisions,

The study of the proton-proton collisions at the beam momentum 1628 MeV/c

\sqrt{s_{NN}}=4-11

Light cluster production at NICA

GeV). We address the directed flow of protons and pions as well as the proton rapidity distribution for two model EoS, one with a first order phase transition the other with a crossover type softening at high densities. The new simulation program has the unique feature that it can describe a hadron-to-quark matter transition which proceeds in the baryon stopping regime that is not accessible to previous simulation programs designed for higher energies.

Evidence for creation of strong electromagnetic fields in relativistic heavy-ion collisions

The detailed investigation of the single pion production reactions pp → pnπ and pp → ppπ at the incident proton momentum 1628 MeV/c has been carried out. The data are analyzed in the framework of the event-by-event maximum-likelihood method together with the pp → ppπ0 data measured earlier in the energy region below 1 GeV. At 1628 MeV/c the largest contributions stem from the 3P2, 3P1, 3P0, 1D2 and 3F2 initial partial waves.

Particle production and chemical freezeout from the hybrid UrQMD approach at NICA energies

Abstract.Light cluster production at the NICA accelerator complex offers unique possibilities to use these states as “rare probes” of in-medium characteristics such as phase space occupation and early flow. In order to explain this statement, in this contribution theoretical considerations from the nuclear statistical equilibrium model and from a quantum statistical model of cluster production are supplemented with a discussion of a transport model for light cluster formation and with results from hydrodynamic simulations combined with the coalescence model.

Three-fluid Hydrodynamics-based Event Simulator Extended by UrQMD final State interactions (THESEUS) for FAIR-NICA-SPS-BES/RHIC energies

Abstract.It is proposed to identify the strong electric field created during relativistic collisions of asymmetric nuclei via observation of pseudorapidity and transverse-momentum distributions of hadrons with the same mass but opposite charges. The detailed calculation results for the directed flow within the Parton-Hadron String Dynamics model are given for Cu-Au interactions at the NICA collision energies of

Medium Effects on Freeze-Out of Light Clusters at NICA Energies

\sqrt{s_{NN}} =

Study of the proton-proton collisions at 1683 MeV/c

9 and 5 GeV. The separation effect is observable at 9GeV as clearly as at 200 GeV.

Feasibility study of heavy ion physics program at NICA

Abstract.The energy dependence of various particle ratios is calculated within the Ultra-relativistic Quantum Molecular Dynamics approach and compared with the hadron resonance gas (HRG) model and measurements from various experiments, including RHIC-BES, SPS and AGS. It is found that the UrQMD particle ratios agree well with the experimental results at the RHIC-BES energies. Thus, we have utilized UrQMD in simulating particle ratios at other beam energies down to 3GeV, which will be accessed at NICA and FAIR future facilities. We observe that the particle ratios for crossover and first-order phase transition, implemented in the hybrid UrQMD v3.4, are nearly indistinguishable, especially at low energies (at large baryon chemical potentials or high density).